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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 25, 2021
Jan. 20, 2021
May 31, 2018
Dec. 31, 2017
May 31, 2019
Jan. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Oct. 02, 2020
Gain (Loss) on Sale of Investments, Total             $ 2,840,170 $ 26,268    
Proceeds from Redemption of Preferred Units             0 6,000,000    
Equity Securities, FV-NI             143,990,739   $ 64,036,482  
Payments to Acquire Equity Method Investments             (0) $ 1,500,000    
Dream Finders Holdings, LLC [Member] | Term Loan Receivable [Member]                    
Notes Receivable, Related Parties                   $ 20,000,000
Note Receivable, Interest Rate                   14.00%
Dream Finders Homes, Inc. [Member]                    
Proceeds from Collection of Notes Receivable $ 20,567,776                  
Common Class A [Member] | IPO [Member] | Dream Finders Homes, Inc. [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)   9,600,000                
Shares Issued, Price Per Share (in dollars per share)   $ 13.00                
Unconsolidated Affiliates [Member]                    
Equity Method Investments             $ 560,579      
Unconsolidated Affiliates [Member] | Minimum [Member]                    
Equity Method Investment, Ownership Percentage             5.60%      
Unconsolidated Affiliates [Member] | Maximum [Member]                    
Equity Method Investment, Ownership Percentage             30.00%      
The 24th Street Fund I, LLC [Member]                    
Equity Method Investment, Ownership Percentage             49.90%      
Payments to Acquire Equity Method Investments             $ 6,000,000      
Breezeway Homes Inc. [Member]                    
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share)           $ 2,665        
Preferred Stock [Member] | Breezeway Homes Inc. [Member]                    
Debt Conversion, Converted Instrument, Shares Issued (in shares)           31,227        
US Treasury Notes Securities [Member]                    
Gain (Loss) on Sale of Investments, Total             23,904      
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member]                    
Payments to Acquire Long-term Investments     $ 19,058,485              
Cost Method Investment, Ownership Percentage     14.99%              
Equity Investments [Member]                    
Other than Temporary Impairment Losses, Investments, Total             0      
Non-voting Common Units of Dream Finders Holdings, LLC [Member]                    
Payments to Acquire Long-term Investments       $ 10,000,000            
Cost Method Investment, Ownership Percentage       5.60%            
Non-voting Preferred Units of DFH LLC [Member]                    
Payments to Acquire Long-term Investments         $ 12,000,000          
Mandatory Preferred Return, Percent         14.00%          
Percent of Preferred Units Convertible to Non-voting Common Units         25.00%          
Proceeds from Redemption of Preferred Units                 $ 12,000,000  
DFH Class A Common Stock [Member]                    
Equity Securities, FV-NI, Shares, Acquired from Conversion (in shares)   4,681,099                
Equity Securities, FV-NI, Shares, Purchase (in shares)   120,000                
Equity Securities, FV-NI, Shares, Purchase, Price Per Share (in dollars per share)   $ 13.00                
DFH Class A Common Stock [Member] | Minimum [Member]                    
Equity Securities, FV-NI             $ 115,000,000